Radar antenna and radar antenna manufacturing method

Abstract

A radar antenna is provided. The radar antenna includes an antenna unit provided with dielectric bodies in a front part thereof in a radio wave radiating direction, a housing unit for supplying a radio wave to the antenna unit, and an antenna supporting unit made of FRP attached between the antenna unit and the housing unit to separate the antenna unit from the housing unit.

The invention claimed is: 
     
       1. A radar antenna, comprising:
 an antenna unit provided with dielectric bodies in a front part thereof in a radio wave radiating direction; 
 a housing unit for supplying a radio wave to the antenna unit and configured to rotate the antenna unit with a rotational shaft, a rotational axis of the rotational shaft perpendicular to a longitudinal direction of the antenna unit; and 
 an antenna supporting unit attached between the antenna unit and the housing unit to separate the antenna unit from the housing unit, the antenna supporting unit including:
 a pedestal attached to the housing unit; 
 an attaching base attached to the antenna unit; and 
 a plurality of supporting bars with a gap therebetween, the plurality of supporting bars connecting the pedestal with the attaching base; 
 
 wherein the antenna supporting unit is built by connecting members made of FRP with each other in an overlapped manner; and 
 wherein at least a part of one of the supporting bars, at least a part of another one of the supporting bars adjacent thereto, and a part of the pedestal between the two supporting bars are formed by a single FRP sheet. 
 
     
     
       2. A radar antenna, comprising:
 an antenna unit provided with dielectric bodies in a front part thereof in a radio wave radiating direction; 
 a housing unit for supplying a radio wave to the antenna unit and configured to rotate the antenna unit with a rotational shaft, a rotational axis of the rotational shaft perpendicular to a longitudinal direction of the antenna unit; and 
 an antenna supporting unit attached between the antenna unit and the housing unit to separate the antenna unit from the housing unit, the antenna supporting unit including:
 a pedestal attached to the housing unit; 
 an attaching base attached to the antenna unit; and 
 a plurality of supporting bars with a gap therebetween, the plurality of supporting bars connecting the pedestal with the attaching base; 
 
 wherein the antenna supporting unit is built by connecting members made of FRP with each other in an overlapped manner; and 
 wherein at least a part of an outermost supporting bar and an end part of the pedestal are formed by a single FRP sheet. 
 
     
     
       3. The radar antenna of  claim 1 , wherein the plurality of supporting bars include two supporting bars, and
 wherein the gap between the supporting bars on a pedestal side is less than that on an attaching base side. 
 
     
     
       4. The radar antenna of  claim 1 , wherein a contour of each supporting bar is a solid cylindrical shape. 
     
     
       5. The radar antenna of  claim 1 , wherein at least one of the supporting bars inclines in the longitudinal direction of the antenna unit. 
     
     
       6. The radar antenna of  claim 1 , wherein the supporting bars are hollow therein. 
     
     
       7. The radar antenna of  claim 1 , wherein the antenna supporting unit inclines toward a rear part of the antenna unit in the radio wave radiating direction. 
     
     
       8. The radar antenna of  claim 2 , wherein the plurality of supporting bars include two supporting bars, and
 wherein the gap between the supporting bars on a pedestal side is less than that on an attaching base side. 
 
     
     
       9. The radar antenna of  claim 2 , wherein a contour of each supporting bar is a solid cylindrical shape. 
     
     
       10. The radar antenna of  claim 2 , wherein at least one of the supporting bars inclines in the longitudinal direction of the antenna unit. 
     
     
       11. The radar antenna of  claim 2 , wherein the supporting bars are hollow therein.